How can i mix mutilple audio streams with a video having embedded audio? Eg i am having video.mp4 which has embedded audio stream. I want to mix one or more audio streams with it,keeping the orignal embedded audio stream. How can i do it? Thanks.
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By mix, do you mean add the other audio streams and keep them distinct, or combine new audio data with the existing one to create a mixdown? – Gyan Feb 07 '17 at 11:42
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Hi. i meant the later. Combine new audio data with the existing one. Thanks. – hack Feb 07 '17 at 11:45
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Please note that ffmpeg command-line questions are off topic here and should be posted on [SU]. Voted to migrate the question. (Please don't cross-post, it can be moved there automatically.) – slhck Feb 07 '17 at 19:21
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Basic template is
ffmpeg -i video.mp4 -i audio1.mp3 -i audio2.mp3 -filter_complex "[0][1][2]amix=3[a]" -map 0:v -map "[a]" -c:v copy out.mp4
Gyan
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